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Title: Drift emplaced waste package thermal response

Thermal calculations of the effects of radioactive waste decay heat on the potential repository at Yucca Mountain, Nevada, have been conducted by the Yucca Mountain Site Characterization Project (YMP) at Lawrence Livermore National Lab. (LLNL) in conjunction with the B&W Fuel Co. For a number of waste package spacings, these 3D transient calculations use the TOPAZ3D code to predict drift wall temperatures to 10,000 years following emplacement. Systematic temperature variation occurs as a function of fuel age at emplacement and Areal Mass Loading (AML) during the first few centuries after emplacement. After about 1000 years, emplacement age is not a strong driver on rock temperature; AML has a larger impact. High AMLs occur when large waste packages are emplaced end-to-end in drifts. Drift emplacement of equivalent packages results in lower rock temperatures than borehole emplacement. For an emplacement scheme with 50% of the drift length occupied by packages, an AML of 138 MTU/acre is about three times higher than the Site Characterization Plan-Conceptual Design (SCP-CD) value. With this higher AML (requiring only 1/3 of the SCP-CD repository footprint), peak drift wall temperatures do not exceed 160{degrees}C, but rock temperatures exceed the boiling point of water for about 3000 years. Thesemore » TOPAZ3D results have been compared with reasonable agreement with two other computer codes.« less
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Lawrence Livermore National Lab., CA (United States)
  2. Lawrence Livermore National Lab., Las Vegas, NV (United States)
  3. B&W Fuel Co., Las Vegas, NV (United States)
Publication Date:
OSTI Identifier:
60872
Report Number(s):
CONF-930408-Vol.1
TRN: 95:004833
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 10. international high-level radioactive waste management conference, Las Vegas, NV (United States), 25-29 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of High Level Radioactive Waste Management: Proceedings. Volume 1; PB: 1115 p.
Publisher:
American Nuclear Society, Inc., La Grange Park, IL (United States)
Research Org:
American Nuclear Society, La Grange Park, IL (United States); American Society of Civil Engineers, New York, NY (United States)
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 54 ENVIRONMENTAL SCIENCES; YUCCA MOUNTAIN; SITE CHARACTERIZATION; HIGH-LEVEL RADIOACTIVE WASTES; UNDERGROUND DISPOSAL; RADIOACTIVE WASTE FACILITIES; THERMAL ANALYSIS; CONFIGURATION; COMPUTER CODES; Yucca Mountain Project